Microgrid control principles in island mode operation

Microgrids are small power systems capable of island and grid modes of operation. They are based on multiple renewable energy sources that produce electricity. Managing their power balance and stability is a challenging task since they depend on quite a number of variables. This paper reviews microgrid control principles according to the IEC/ISO 62264 standard along with an example system where electricity is supplied by two renewable energy devices including a PV panel, a Doubly-Fed Induction Generator (DFIG) wind turbine and battery storage. The storage system provides the integral system backup and the storage of surplus energy from renewable sources. System simulation is made with PSCAD/EMTDC software.